I have fish eggs wow. They are in small round spots, in middle of the leaf, and are black. I don't know if its my 7 neon tetra or my 2 Otocinclus, my zebra snail, or my 4 Rummy Nose. Seem to me its my Otto. So my eggs are maybe not fertilize. But from what i know, my eggs are black right now, whits means their are fertilize right? Must i be buying other Otto or are they ok?